<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>文本修饰</title>
    <style type="text/css">
        .a{
            text-decoration: overline;
        }
        .b{
            text-decoration: underline;
        }
        .c{
            text-decoration: line-through;
        }
    </style>
</head>
<body>
    <div class="a">
        线在哪
    </div>
    <div class="b">
        线在哪
    </div>
    <div class="c">
        线在哪
    </div>
</body>
</html>